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LTC4252-1 Datasheet(数据表) 1 Page - Linear Technology

部件型号  LTC4252-1
说明  Negative Voltage Hot Swap Controllers
下载  36 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
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LTC4252-1 Datasheet(HTML) 1 Page - Linear Technology

 
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LTC4252-1/LTC4252-2
LTC4252A-1/LTC4252A-2
1
425212fb
The LTC
®4252 negative voltage Hot SwapTM controller
allows a board to be safely inserted and removed from a
live backplane. Output current is controlled by three stages
of current limiting: a timed circuit breaker, active current
limiting and a fast feedforward path that limits peak
current under worst-case catastrophic fault conditions.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4252’s supply input is
shunt regulated, allowing safe operation with very high
supply voltages. A multifunction timer delays initial start-
up and controls the circuit breaker’s response time. The
circuit breaker’s response time is accelerated by sensing
excessive MOSFET drain voltage, keeping the MOSFET
within its safe operating area (SOA). An adjustable soft-
start circuit controls MOSFET inrush current at start-up.
The LTC4252-1/LTC4252A-1 latch off after a circuit breaker
fault times out. The LTC4252-2 provides automatic retry
after a fault. The LTC4252A-1/LTC4252A-2 feature tight
±1% undervoltage/overvoltage threshold accuracy. The
LTC4252 is available in either an 8-pin or 10-pin MSOP.
Hot Board Insertion
Electronic Circuit Breaker
– 48V Distributed Power Systems
Negative Power Supply Control
Central Office Switching
High Availability Servers
ATCA
Allows Safe Board Insertion and Removal from a
Live – 48V Backplane
Floating Topology Permits Very High Voltage
Operation
Programmable Analog Current Limit With Circuit
Breaker Timer
Fast Response Time Limits Peak Fault Current
Programmable Soft-Start Current Limit
Programmable Timer with Drain Voltage
Accelerated Response
±1% Undervoltage/Overvoltage Threshold Accuracy
(LTC4252A)
Adjustable Undervoltage/Overvoltage Protection
LTC4252-1/LTC4252A-1: Latch Off After Fault
LTC4252-2: Automatic Retry After Fault
Available in 8-Pin and 10-Pin MSOP Packages
Negative Voltage
Hot Swap Controllers
– 48V/2.5A Hot Swap Controller
4252-1/2 TA01
GND
OV
UV
VEE
VIN
SENSE
SS
TIMER
GATE
PWRGD
DRAIN
LTC4252-1
R1
402k
1%
R2
32.4k
1%
CT
0.33
µF
CSS
68nF
CC
18nF
–48V
RS
0.02
Q1
IRF530S
VOUT
RC
10
R3
5.1k
RIN
3
× 1.8k IN SERIES
1/4W EACH
C1
10nF
CIN
1
µF
CL
100
µF
GND
(SHORT PIN)
+
RD 1M
LOAD
EN
*
* M0C207
4252-1/2 TA01a
GATE
5V/DIV
SENSE
2.5A/DIV
PWRGD
10V/DIV
1ms/DIV
VOUT
20V/DIV
Start-Up Behavior
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.




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